Rule-joint.



Ti PRENTIGE.

BULB JOINT.

AEPLIOATIOH FILED JUNE 6, 1907.

l 999581.@0 l Patented Jan. 12, 1909.

, of Connecticut, have invented .certain new ally' joiningtogethei the sections of a rule i f plates going to make u vis a perspective view o Aa i thc other side of the plate shown in Fig.- 6;

" more particularly designed for' 4use upon UNITED salutaire!A PATENT carica.

THOMAS PRENTICE, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR T THE PRENTICE MANU- FACTURING COMPANY, OF MIDDLETOWN, CONNECTICUT, A CORPORATION OFI CONNECTI- RULE-JOINT.

No. 909,819. specificati@ of Letters Patent. i Patented :aal 1a,v1oo.

Application led June 6,1907. Serial No. 377,51?, To all 'whom it may aendern:

Be it known that I, THOMAS PREN'rioE, a citizen'of the United States, residing in New Br1tain, in the county of Hartford and State stctions are illustrated. For the purpose o in Rule-Joints, of stituting the plates are provided Withholes 16 for'receivand useful Improvements which the following is a specification.

This invention relates to rule joints, and i has for an object to provide means for pivotl in such a manner that longitudinal movement of theV sections one relative to the other will be prevented, for relieving the pivotal rivet holding the locking plates together preventing the portions of the device oonp In the present drawings a number of such l from strain andy-the rivet holes from eni" ing a' pivotal rivet 17, which rivet may lbe largement due to the strain and wear. f provided with a s ringplate 18 for permit- In the' use of rules, more particularly ting it to yield wlhen the parts are turned, those which. embody a number of .thin secl since it will be apparent that the protruding tions which fold up iiatwise one upon the portion 14-will be 'drawn into, the cavit 13 other, it has 'been found that the present f when the two sections carrying'the pates method of pivoting the sections together p'er- -12 and 15 are turned so thatwthe sections are mits a certain amount of lon 'tudinal movelongitudinally disposed one relative to the ment of the sectionsone relative to the other other. Upon turning the sections out of this when these are extended, which movement position `the faces of the protruding porprevents accuracy in measurement, and the l tion 14 will ride up 'the faces 21 of the cavity movement also when the sections are closed,

13 and the iiexibility of tlie plates and of the together prevents the members of the pile of spring 18 will be' called into play for persections from having a rin relation. The i mitting this movement. present improvement, however, rovides On this class of rules heretofore the lon-u means for taking the strain in a irection gitudinal strain u on the rule sections when longitudinally of the rule sections, oil'l of the these have been olded up into Vparallelism pivotal rivet and placing this upon faces or when extended longitudinally has been which will receive such strain.-

'borne by the rivet which constituted the In the drawings accompanying and formpivot. The plates carried by, the rule seeingapai-t of this speciiicatiomlgure 1 is a tions are usually made of thin sheet metal, top view of a portion of a rule equipped with and a hole is punched through each plate, my present improvement. Fig. 2 is an edge and the plates will be fastened together by view of a rule embodying two sections a rivet. The rivet is .small and it'will wear fastened together by my present improveback the edges of .the plate at the rivet hole; ment. Fig. 3 is a longitudinal section of and the plates beingtlunand sharp at the the device shown in Fig. 2. Fig. 4 is a edges ofthe rivet hole will cut the rivet.` perspective view of the end of a rule pre- In my present improvement one of the pared to receive my improved rule joint. plates 1s provided, as was before stated, with Fig. 5 is a perspective view of one ofthe the protrusion 14 and the..-other,1s rovided the joint. Fig. 6 with the cavity or 'socket 13. ese are plate for mating shown in the socket member two pairs of with the plate shown in Fig. 5. Figs. 5 and corners Q4OQ40 and 24W-240 G show the plates in the relation in which as it were, into the socket: Between the c orthey will be assembled. Fig. 7 is a view of ners of the respective pairs are the bearing faces 24 and 24, which faces ai'e'segmental, having as a common center the center of the rivet or its hole 16. The protruding meinber has two pairs of corners 250-250 and 25W-250 indented, as it Were, into it. VBetweeii'thefcorners of the respective pairs are and Fig. 8 1s a cross section of the plates, shown siiperposed but not assembled. i

As was stated in the introduction to this specification the present improvement is projecting,A

the hearing feces 25 and 25, which Yfaces are segmental and will tit insideV of the Jraces 24er-2e', the faces 25425 having as a comY e mon center Athe 'center of the rivet or the rivet bringing the sections into parallelism andl into longitudinal relation, .and will during such times relieve the rivet entirely of its functions as pivot or pintl'e.

Instead of the small surface of the rivet bea pintle many times larger in diameter l will he celled interplay. The sharp edge of .the thin sheet Ymetal, the thickness ot the plete, is presented to the rivet; but here the much wider .faces E24-24? and 25-25 come together, thus preventing the cutting of the rivet andthe wearing aivsyrof the edge of the plate at the rivet above referred to. Even if such Wearing awa i of the plate and of Lherivet does take pince at the times when itis desired to have accuracy, namely when rule sections areextended and when they arofolded together, the faces above referred to, of this large pintie, Vwill come intofengagement end be' eiiective in holding the sections in proper relation one to the others. The corners 'E40-240 and 24W- 240' enter the indentations 250--250 and 250- 25.6" when the rule sections are: alined and when they' are brought into parallelism, The engagement of these corners with they against relative longitudinal movement, but

, a so against engelen movement about the presents sncle. structure that when the arts ure mede in erchsngcehle, 'as they Wi be riiipmctics, neet eocnraey will resultand recesses securely hold the sections notionlyY Vthese corners will cooperate with the segmental faces in taking the strain oit of the rivet and the plete atfthe rivet hole.

l Having described my invention. clsirn: l. The combination with a pair oi' rule sections, of pl etes carried by the sections, one

plate hnvingra cavity formed in it and the'V corners extending into the cavity, the other.

plate having a protrusion fory entering the cavity, and such protrusion having recesses for receiving the stud corners, and a rivet connecting said plates and disposed. in such plates centrally ofthe corners'and `'recesses respectively. Y

2.V The combination with a pair of rule sections, of plates carried by the sections, one

plate having' a cavity formed in it and the other plate having a protrusion for entering' the cavity, seid protrusion having two mental bearing faces having the same'center, and recesses at the ends o the said laces, and said cavity having two meting segmentsl feces, and corners at the ends of the said facesV for entering the seid recesses, and e pivotal connection torV said plates axially vio coincident with the center'of saidV segmental bearing faces, the said faces, the corners and recesses being constructed and'adepted for interenga ement upon the rule sections being exten ed longitudinally and being folded together. f

rule embodying sections, e rivet for pivoting one section to another, and fm enlarged VsegmentalY pintle Y surrounding the rivet for taking theV Working streinnoi the rivetrwhen the sections ere longitudi nelly extended and when folded up in parallelism, and means for unseating the segmental pin'tle upon angular movement of one section relative to the other.

Y THOMAS. PRSEN'IlCll.

VVitnesses':

, VInLrAM F. DELA-inni',

JLG. LINCOLN.

so Y 

